TiXmlHandle Class Reference

A TiXmlHandle is a class that wraps a node pointer with null checks; this is an incredibly useful thing. More...

#include <tinyxml.h>

Collaboration diagram for TiXmlHandle:

Public Member Functions
	TiXmlHandle (TiXmlNode *_node)
	Create a handle from any node (at any depth of the tree.) This can be a null pointer.
	TiXmlHandle (const TiXmlHandle &ref)
	Copy constructor.
TiXmlHandle	operator= (const TiXmlHandle &ref)
TiXmlHandle	FirstChild () const
	Return a handle to the first child node.
TiXmlHandle	FirstChild (const char *value) const
	Return a handle to the first child node with the given name.
TiXmlHandle	FirstChildElement () const
	Return a handle to the first child element.
TiXmlHandle	FirstChildElement (const char *value) const
	Return a handle to the first child element with the given name.
TiXmlHandle	Child (const char *value, int index) const
	Return a handle to the "index" child with the given name.
TiXmlHandle	Child (int index) const
	Return a handle to the "index" child.
TiXmlHandle	ChildElement (const char *value, int index) const
	Return a handle to the "index" child element with the given name.
TiXmlHandle	ChildElement (int index) const
	Return a handle to the "index" child element.
TiXmlHandle	FirstChild (const std::string &_value) const
TiXmlHandle	FirstChildElement (const std::string &_value) const
TiXmlHandle	Child (const std::string &_value, int index) const
TiXmlHandle	ChildElement (const std::string &_value, int index) const
TiXmlNode *	ToNode () const
	Return the handle as a TiXmlNode.
TiXmlElement *	ToElement () const
	Return the handle as a TiXmlElement.
TiXmlText *	ToText () const
	Return the handle as a TiXmlText.
TiXmlUnknown *	ToUnknown () const
	Return the handle as a TiXmlUnknown.
TiXmlNode *	Node () const
TiXmlElement *	Element () const
TiXmlText *	Text () const
TiXmlUnknown *	Unknown () const

Private Attributes
TiXmlNode *	node

Detailed Description

A TiXmlHandle is a class that wraps a node pointer with null checks; this is an incredibly useful thing.

Note that TiXmlHandle is not part of the TinyXml DOM structure. It is a separate utility class.

Take an example:

<Document>
  <Element attributeA = "valueA">
    <Child attributeB = "value1" />
    <Child attributeB = "value2" />
  </Element>
<Document>

Assuming you want the value of "attributeB" in the 2nd "Child" element, it's very easy to write a lot of code that looks like:

TiXmlElement* root = document.FirstChildElement( "Document" );
if ( root )
{
  TiXmlElement* element = root->FirstChildElement( "Element" );
  if ( element )
  {
    TiXmlElement* child = element->FirstChildElement( "Child" );
    if ( child )
    {
      TiXmlElement* child2 = child->NextSiblingElement( "Child" );
      if ( child2 )
      {
        // Finally do something useful.

And that doesn't even cover "else" cases. TiXmlHandle addresses the verbosity of such code. A TiXmlHandle checks for null pointers so it is perfectly safe and correct to use:

TiXmlHandle docHandle( &document );
TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild(
"Element"
).Child( "Child", 1 ).ToElement();
if ( child2 )
{
  // do something useful

Which is MUCH more concise and useful.

It is also safe to copy handles - internally they are nothing more than node pointers.

TiXmlHandle handleCopy = handle;

What they should not be used for is iteration:

int i=0;
while ( true )
{
  TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild(
"Element"
).Child( "Child", i ).ToElement();
  if ( !child )
    break;
  // do something
  ++i;
}

It seems reasonable, but it is in fact two embedded while loops. The Child method is a linear walk to find the element, so this code would iterate much more than it needs to. Instead, prefer:

TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element"
).FirstChild( "Child" ).ToElement();

for( child; child; child=child->NextSiblingElement() )
{
  // do something
}

Definition at line 1951 of file tinyxml.h.

Constructor & Destructor Documentation

TiXmlHandle() [1/2]

TiXmlHandle::TiXmlHandle ( TiXmlNode * _node )

inline

Create a handle from any node (at any depth of the tree.) This can be a null pointer.

Definition at line 1956 of file tinyxml.h.

{ this->node = _node; }

References node.

Referenced by TiXmlHandle(), Child(), Child(), Child(), ChildElement(), ChildElement(), ChildElement(), FirstChild(), FirstChild(), FirstChild(), FirstChildElement(), FirstChildElement(), FirstChildElement(), and operator=().

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TiXmlHandle() [2/2]

TiXmlHandle::TiXmlHandle ( const TiXmlHandle & ref )

inline

Copy constructor.

Definition at line 1958 of file tinyxml.h.

{ this->node = ref.node; }

References TiXmlHandle(), and node.

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Member Function Documentation

Child() [1/3]

TiXmlHandle TiXmlHandle::Child	(	const char *	value,
		int	index ) const

Return a handle to the "index" child with the given name.

The first child is 0, the second 1, etc.

Definition at line 1590 of file tinyxml.cpp.

                                                                 {
  if (node) {
    int        i;
    TiXmlNode* child = node->FirstChild(value);
 
    for (i = 0; child && i < count; child = child->NextSibling(value), ++i) {
      // nothing
    }
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), TiXmlNode::NextSibling(), and node.

Referenced by Child().

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Child() [2/3]

TiXmlHandle TiXmlHandle::Child ( const std::string & _value, int index ) const

inline

Definition at line 2002 of file tinyxml.h.

                                                              {
    return Child(_value.c_str(), index);
  }

References TiXmlHandle(), and Child().

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Child() [3/3]

TiXmlHandle TiXmlHandle::Child

(

int

index

)

const

Return a handle to the "index" child.

The first child is 0, the second 1, etc.

Definition at line 1575 of file tinyxml.cpp.

                                              {
  if (node) {
    int        i;
    TiXmlNode* child = node->FirstChild();
 
    for (i = 0; child && i < count; child = child->NextSibling(), ++i) {
      // nothing
    }
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), TiXmlNode::NextSibling(), and node.

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ChildElement() [1/3]

TiXmlHandle TiXmlHandle::ChildElement	(	const char *	value,
		int	index ) const

Return a handle to the "index" child element with the given name.

The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.

Definition at line 1620 of file tinyxml.cpp.

                                                                        {
  if (node) {
    int           i;
    TiXmlElement* child = node->FirstChildElement(value);
 
    for (i = 0; child && i < count;
         child = child->NextSiblingElement(value), ++i) {
      // nothing
    }
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), TiXmlNode::NextSiblingElement(), and node.

Referenced by ChildElement().

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ChildElement() [2/3]

TiXmlHandle TiXmlHandle::ChildElement ( const std::string & _value, int index ) const

inline

Definition at line 2005 of file tinyxml.h.

                                                                     {
    return ChildElement(_value.c_str(), index);
  }

References TiXmlHandle(), and ChildElement().

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ChildElement() [3/3]

TiXmlHandle TiXmlHandle::ChildElement

(

int

index

)

const

Return a handle to the "index" child element.

The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.

Definition at line 1605 of file tinyxml.cpp.

                                                     {
  if (node) {
    int           i;
    TiXmlElement* child = node->FirstChildElement();
 
    for (i = 0; child && i < count; child = child->NextSiblingElement(), ++i) {
      // nothing
    }
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), TiXmlNode::NextSiblingElement(), and node.

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Element()

TiXmlElement * TiXmlHandle::Element ( ) const

inline

Deprecated

use ToElement. Return the handle as a TiXmlElement. This may return null.

Definition at line 2036 of file tinyxml.h.

{ return ToElement(); }

References ToElement().

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FirstChild() [1/3]

TiXmlHandle TiXmlHandle::FirstChild

(

)

const

Return a handle to the first child node.

Definition at line 1535 of file tinyxml.cpp.

                                          {
  if (node) {
    TiXmlNode* child = node->FirstChild();
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), and node.

Referenced by FirstChild().

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FirstChild() [2/3]

TiXmlHandle TiXmlHandle::FirstChild

(

const char *

value

)

const

Return a handle to the first child node with the given name.

Definition at line 1545 of file tinyxml.cpp.

                                                           {
  if (node) {
    TiXmlNode* child = node->FirstChild(value);
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), and node.

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FirstChild() [3/3]

TiXmlHandle TiXmlHandle::FirstChild ( const std::string & _value ) const

inline

Definition at line 1995 of file tinyxml.h.

                                                        {
    return FirstChild(_value.c_str());
  }

References TiXmlHandle(), and FirstChild().

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FirstChildElement() [1/3]

TiXmlHandle TiXmlHandle::FirstChildElement

(

)

const

Return a handle to the first child element.

Definition at line 1555 of file tinyxml.cpp.

                                                 {
  if (node) {
    TiXmlElement* child = node->FirstChildElement();
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), and node.

Referenced by FirstChildElement().

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FirstChildElement() [2/3]

TiXmlHandle TiXmlHandle::FirstChildElement

(

const char *

value

)

const

Return a handle to the first child element with the given name.

Definition at line 1565 of file tinyxml.cpp.

                                                                  {
  if (node) {
    TiXmlElement* child = node->FirstChildElement(value);
 
    if (child) return TiXmlHandle(child);
  }
 
  return TiXmlHandle(0);
}

References TiXmlHandle(), and node.

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FirstChildElement() [3/3]

TiXmlHandle TiXmlHandle::FirstChildElement ( const std::string & _value ) const

inline

Definition at line 1998 of file tinyxml.h.

                                                               {
    return FirstChildElement(_value.c_str());
  }

References TiXmlHandle(), and FirstChildElement().

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Node()

TiXmlNode * TiXmlHandle::Node ( ) const

inline

Deprecated

use ToNode. Return the handle as a TiXmlNode. This may return null.

Definition at line 2032 of file tinyxml.h.

{ return ToNode(); }

References ToNode().

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operator=()

TiXmlHandle TiXmlHandle::operator= ( const TiXmlHandle & ref )

inline

Definition at line 1959 of file tinyxml.h.

                                              {
    this->node = ref.node;
    return *this;
  }

References TiXmlHandle(), and node.

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Text()

TiXmlText * TiXmlHandle::Text ( ) const

inline

Deprecated

use ToText() Return the handle as a TiXmlText. This may return null.

Definition at line 2040 of file tinyxml.h.

{ return ToText(); }

References ToText().

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ToElement()

TiXmlElement * TiXmlHandle::ToElement ( ) const

inline

Return the handle as a TiXmlElement.

This may return null.

Definition at line 2015 of file tinyxml.h.

                                  {
    return ((node && node->ToElement()) ? node->ToElement() : 0);
  }

References node.

Referenced by Element().

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ToNode()

TiXmlNode * TiXmlHandle::ToNode ( ) const

inline

Return the handle as a TiXmlNode.

This may return null.

Definition at line 2012 of file tinyxml.h.

{ return node; }

References node.

Referenced by Node().

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ToText()

TiXmlText * TiXmlHandle::ToText ( ) const

inline

Return the handle as a TiXmlText.

This may return null.

Definition at line 2020 of file tinyxml.h.

                            {
    return ((node && node->ToText()) ? node->ToText() : 0);
  }

References node.

Referenced by Text().

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ToUnknown()

TiXmlUnknown * TiXmlHandle::ToUnknown ( ) const

inline

Return the handle as a TiXmlUnknown.

This may return null.

Definition at line 2025 of file tinyxml.h.

                                  {
    return ((node && node->ToUnknown()) ? node->ToUnknown() : 0);
  }

References node.

Referenced by Unknown().

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Unknown()

TiXmlUnknown * TiXmlHandle::Unknown ( ) const

inline

Deprecated

use ToUnknown() Return the handle as a TiXmlUnknown. This may return null.

Definition at line 2044 of file tinyxml.h.

{ return ToUnknown(); }

References ToUnknown().

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Member Data Documentation

node

TiXmlNode* TiXmlHandle::node

private

Definition at line 2047 of file tinyxml.h.

Referenced by TiXmlHandle(), TiXmlHandle(), Child(), Child(), ChildElement(), ChildElement(), FirstChild(), FirstChild(), FirstChildElement(), FirstChildElement(), operator=(), ToElement(), ToNode(), ToText(), and ToUnknown().

---

The documentation for this class was generated from the following files:

• agrum/base/external/tinyxml/ticpp/tinyxml.h
• agrum/base/external/tinyxml/ticpp/tinyxml.cpp